Zhu Qiqian regarded classical Chinese gardens as a unique category within China’s system of traditional architecture and paid great attention to them. He once presided over the transformation of the Shejitan (Altar of Land and Grain) into Beijing’s new Central Park that was designed in traditional style. When Zhu was in charge of the Zhongguo Yingzao Xueshe (Society for Research in Chinese Architecture), he initiated research on gardens in northern and southern China and made great efforts to collect and publish relevant ancient books and historical documents. He also promoted the protection of garden heritage and contributed to the biography of historical garden designers in the records of philosophers and craftsmen. Through analysis of historical documents, this paper reviews the mark left by Zhu Qiqian in the field of classical garden studies.